PlantPen PRI 200 & NDVI 300

· PRI (Photochemical Reflectance Index) = (R531 -R570) / (R531+R570) Reference: Sellers et al. (1985)

· NDVI (Normalized Difference Vegetative Index) NDVI = (NIR – VIS) / (NIR + VIS)

· Internal dual wavelength light source R531 = 531 nm, R570 = 570 nm for PRI 210

· Internal dual wavelength light VIS = 635 nm (bandwidth 625 nm – 645 nm), NIR = 760 nm (bandwidth 750 nm – 760 nm)

· PIN photodiode with 500 to 600 nm bandpass filters for PRI 210;

· PIN photodiode with 620 to 750 nm bandpass filters for NDVI 310